Grease pumping device of grease gun

Abstract

The utility model belongs to the technical field of grease guns, in particular to a grease pumping device of a grease gun, which comprises a threaded rod, a connecting cover and a piston, the connecting cover is sleeved on the threaded rod and can be directly or indirectly connected with a grease gun barrel, the piston is sleeved on the threaded rod, a threaded hole is arranged on the piston, and the threaded rod is arranged in the threaded hole and is in threaded connection with the piston. A telescopic rod for limiting the piston to rotate relative to the threaded rod is arranged between the piston and the connecting cover, the two ends of the telescopic rod are connected with the connecting cover and the piston respectively, and the piston can be driven to move front and back along the threaded rod by driving the threaded rod to rotate. According to the grease pumping device, a screw transmission structure is adopted to pump grease into the grease gun barrel, so that the efficient and labor-saving effect is achieved, some users with small arm strength can complete the grease pumping work of the grease gun barrel at a time, and therefore the working efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of grease gun technology, and specifically refers to a grease gun extraction device. Background Technology

[0002] With social progress and rapid industrial development, machinery in all industries requires lubrication, and lubrication tools are constantly emerging. The most widely used is the grease gun. A grease gun is a tool for adding grease to machinery and is an essential tool for agricultural machinery operators and repair shops. Currently, most grease guns on the market use a pumping device on the barrel to draw grease into the gun. This pumping device consists of a piston, a chain, and a pull ring. Users must first insert the front of the gun barrel into the grease chamber, then pull the pull ring to move the chain. Ultimately, the chain moves the piston backward, drawing the grease into the gun barrel. However, because the piston... During the backward movement, the spring force needs to be overcome to compress the spring, and the front end of the barrel is inserted into the grease. At this time, there is a certain pressure difference between the inside of the barrel and the outside. When the user pulls the piston backward by pulling the ring, he also needs to overcome the pressure difference, which requires the user to exert a lot of force to pull the ring and finally complete the grease pumping work. The shorter the spring is compressed, the greater the spring force that the user needs to overcome. The further the piston moves, the more force the user needs to exert to overcome the spring force. Some young people with less arm strength may not even be able to complete the grease pumping work in one go, which affects work efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a simple grease extraction device that uses a screw drive structure to draw grease into the grease gun barrel, thereby achieving a high-efficiency and labor-saving effect. Even users with less arm strength can complete the grease extraction work in one go, thus improving work efficiency.

[0004] The purpose of this utility model is achieved as follows:

[0005] A grease gun's extraction device includes a threaded rod, a connecting cap sleeved on the threaded rod and directly or indirectly connected to the grease gun barrel, and a piston sleeved on the threaded rod. The piston has a threaded hole, and the threaded rod is disposed in the threaded hole and threadedly connected to the piston. A telescopic rod is provided between the piston and the connecting cap to restrict the piston's rotation relative to the threaded rod. The two ends of the telescopic rod are respectively connected to the connecting cap and the piston. Driving the threaded rod to rotate can drive the piston to move back and forth along the threaded rod.

[0006] Furthermore, the telescopic rod includes a left telescopic rod and a right telescopic rod, the threaded rod is located between the left telescopic rod and the right telescopic rod, and the two ends of the left telescopic rod and the right telescopic rod are respectively fixedly connected to the connecting cover and the piston.

[0007] Furthermore, the telescopic rod includes a first telescopic rod and a second telescopic rod sleeved on the first telescopic rod. The rear end of the first telescopic rod is fixedly connected to the connecting cover, the rear end of the second telescopic rod is sleeved on the front end of the first telescopic rod, and the front section of the second telescopic rod is fixedly connected to the piston.

[0008] Furthermore, a push-oil spring is provided between the piston and the connecting cover. The two ends of the push-oil spring abut against the connecting cover and the piston, respectively. An abutment groove is provided at the top of the piston, and the threaded hole is opened in the abutment groove. The bottom end of the push-oil spring is located in the abutment groove.

[0009] Furthermore, the inner wall of the connecting cover is provided with an internal thread, which can match the external thread at the top of the grease gun barrel, and the bottom of the connecting cover is provided with a through hole, and the top of the threaded rod is provided with a driving part with a smooth outer wall, the driving part passes through the through hole and is located above the connecting cover, and the driving part is provided with a rotating handle.

[0010] Furthermore, a bearing groove is formed at the bottom of the connecting cover, and a through hole is formed at the bottom of the bearing groove. A bearing is provided in the bearing groove, and the bearing is sleeved on the drive unit.

[0011] Furthermore, a sealing groove is provided on the outer wall of the piston, and a sealing ring is provided in the sealing groove, which can fit into the inside of the grease gun barrel.

[0012] Furthermore, the threaded rod is provided with a free-spinning part with a smooth outer wall. The free-spinning part is located below the connecting cover. When the threaded rod is driven to rotate and the piston moves backward onto the free-spinning part, the piston and the threaded rod are in a disengaged state.

[0013] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0014] This utility model belongs to the technical field of grease guns, specifically referring to a grease extraction device for a grease gun. It includes a threaded rod, a connecting cap sleeved on the threaded rod and directly or indirectly connected to the grease gun barrel, and a piston sleeved on the threaded rod. The piston has a threaded hole, and the threaded rod is threadedly connected to the piston within the threaded hole. A telescopic rod is provided between the piston and the connecting cap to restrict the piston's rotation relative to the threaded rod. The two ends of the telescopic rod are connected to the connecting cap and the piston, respectively. Driving the threaded rod to rotate causes the piston to move back and forth along the threaded rod. When installing the extraction device, the threaded rod and piston are placed on the grease gun barrel. Inside the grease gun barrel, the inner wall of the piston fits snugly against the inner wall of the grease gun barrel. Since the connecting cap is the rear cap of a commercially available grease gun barrel, it can be threaded onto the rear end of the grease gun barrel, thus fixing the grease extraction device inside the grease gun barrel. The threaded rod is located inside the threaded hole of the piston and threadedly connected to the piston. A telescopic rod restricts the piston's rotation relative to the threaded rod between the piston and the connecting rod. When the user controls the rotation of the threaded rod, the piston will rotate backward along the threaded rod. At this time, the telescopic rod will retract, allowing the piston to move backward normally. The piston then draws grease into the grease gun barrel. Inside the grease gun barrel, the grease is drawn out, thus completing the grease extraction process. This differs from existing grease guns on the market, which require pulling a ring to move a chain, ultimately causing the chain to move a piston backward to draw grease into the barrel. However, because the piston needs to overcome the spring force and air pressure difference to move backward, the user needs to expend considerable force to complete the grease extraction. Furthermore, the shorter the spring compression, the greater the spring force the user needs to overcome; the further the piston moves, the more force the user needs to expend to overcome the spring force. Some young people with less arm strength cannot even complete the grease gun extraction in one go, affecting work efficiency. This utility model uses a piston connected to a threaded rod and a telescopic rod, so that the piston can only move back and forth along the threaded rod. The rotation of the threaded rod drives the piston to move backward, thus smoothly drawing the grease into the grease gun. This screw drive structure can achieve a highly efficient and labor-saving effect, making it easier and less strenuous for users to draw grease into the grease gun. Even users with less arm strength can complete the grease gun extraction in one go, thereby improving work efficiency. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention.

[0016] Figure 2 This is a perspective view of the present invention.

[0017] Figure 3 This is a cross-sectional view of the present invention.

[0018] Figure 4This is a schematic diagram of the structure of this utility model.

[0019] Figure 5 This is an exploded view of this utility model.

[0020] Figure 6 This is an exploded view of the threaded rod, bearing, and rotating handle of this utility model.

[0021] Figure 7 This is an exploded view of the left telescopic rod, right telescopic rod, connecting cover, and piston of this utility model.

[0022] Figure 8 This is an exploded view of the anti-rotation device of this utility model.

[0023] Figure 9 This is a perspective view of the connecting cover of this utility model.

[0024] The meaning of the labels in the diagram:

[0025] 1-Threaded rod; 2-Connecting cap; 3-Piston; 4-Threaded hole; 5-First telescopic rod;

[0026] 6-Second telescopic rod; 7-Left telescopic rod; 8-Right telescopic rod; 9-Hydraulic spring; 10-Abutment groove;

[0027] 11-Through hole; 12-Drive unit; 13-Rotating handle; 14-Bearing groove; 15-Bearing;

[0028] 16-Sealed channel; 17-Idle section. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments:

[0030] This utility model belongs to the field of grease gun technology, specifically referring to a grease gun extraction device, including a threaded rod 1, a connecting cover 2 sleeved on the threaded rod 1 and directly or indirectly connected to the grease gun barrel, and a piston 3 sleeved on the threaded rod 1. The piston 3 has a threaded hole 4, and the threaded rod 1 is threadedly connected to the piston 3 within the threaded hole 4. A telescopic rod is provided between the piston 3 and the connecting cover 2 to restrict the rotation of the piston 3 relative to the threaded rod 1. The two ends of the telescopic rod are respectively connected to the connecting cover 2 and the piston 3. Driving the threaded rod 1 to rotate can cause the piston 3 to move back and forth along the threaded rod 1. When installing the extraction device, the threaded rod... 1. Piston 3 is placed inside the grease gun barrel, so that the inner wall of piston 3 fits against the inner wall of the grease gun barrel. Since the connecting cover 2 is the gun cover at the rear end of the grease gun barrel on the market, it can be connected to the rear end of the grease gun barrel by threads, thereby fixing the grease extraction device inside the grease gun barrel. The threaded rod 1 is located in the threaded hole 4 of piston 3 and is threadedly connected to piston 3. There is a telescopic rod between piston 3 and connecting rod that restricts the rotation of piston 3 relative to threaded rod 1. When the user controls the threaded rod 1 to rotate, piston 3 will rotate backward along threaded rod 1. At this time, the telescopic rod will retract, allowing piston 3 to move backward normally. At this point, piston 3 will draw grease into the grease gun barrel, thus completing the grease extraction process. Compared to other grease guns on the market, which require pulling a ring to move a chain during grease filling, this method is significantly different. The chain moves piston 3 backward to draw grease into the barrel, but this requires overcoming spring force and air pressure differences, demanding considerable effort from the user. Furthermore, the shorter the spring compression, the greater the spring force required to overcome. As piston 3 moves further back, the user needs to exert significantly more force to overcome the spring. The elasticity of the grease gun is limited, and some young people with less arm strength may not be able to complete the grease extraction in one go, affecting work efficiency. This utility model adopts a screw connection between piston 3 and threaded rod 1, and with the help of a telescopic rod, the piston 3 can only move back and forth along the threaded rod 1. The rotation of the threaded rod 1 drives the piston 3 to move backward, thereby smoothly drawing the grease into the grease gun. This screw transmission structure can achieve a highly efficient and labor-saving effect, making it easier and less strenuous for users to draw grease into the grease gun. Even users with less arm strength can complete the grease extraction in one go, thereby improving work efficiency.

[0031] Preferably, the telescopic rod includes a left telescopic rod 7 and a right telescopic rod 8, with the threaded rod 1 located between the left telescopic rod 7 and the right telescopic rod 8. The two ends of the left telescopic rod 7 and the right telescopic rod 8 are respectively fixedly connected to the connecting cover 2 and the piston 3. The telescopic rod is composed of the left telescopic rod 7 and the right telescopic rod 8. The number of telescopic rods is two, which can better restrict the rotation of the piston 3 relative to the threaded rod 1, ensuring that the piston 3 can only move back and forth along the threaded rod 1 during the rotation of the threaded rod 1.

[0032] Preferably, the telescopic rod includes a first telescopic rod 5 and a second telescopic rod 6 sleeved on the first telescopic rod 5. The rear end of the first telescopic rod 5 is fixedly connected to the connecting cover 2, the rear end of the second telescopic rod 6 is sleeved on the front end of the first telescopic rod 5, and the front end of the second telescopic rod 6 is fixedly connected to the piston 3. The telescopic rod is a common retractable device on the market, consisting of a first telescopic rod 5 and a second telescopic rod 6 sleeved on the first telescopic rod 5, allowing the first telescopic rod 5 to retract into the second telescopic rod 6. The rear end of the first telescopic rod 5 is fixedly connected to the connecting cover 2, and the second telescopic rod 6... The front end of the retractable rod 6 is fixedly connected to the piston 3, while the rear end of the second telescopic rod 6 is sleeved on the front end of the first telescopic rod 5. Thus, when the user controls the threaded rod 1 to rotate, the piston 3 will not rotate synchronously with the threaded rod 1, allowing the piston 3 to move smoothly backward along the threaded rod 1. When the piston 3 moves backward, the second telescopic rod 6 will move backward synchronously. When the second telescopic rod 6 moves backward, the first piston 3 and the second piston 3 will retract smoothly together, preventing the piston 3 from being unable to move backward due to the inability of the first telescopic rod 5 and the second telescopic rod 6 to retract.

[0033] Preferably, a push spring 9 is provided between the piston 3 and the connecting cover 2. The two ends of the push spring 9 abut against the connecting cover 2 and the piston 3 respectively. The top end of the piston 3 is provided with an abutment groove 10, and the threaded hole 4 is opened in the abutment groove 10. The bottom end of the push spring 9 is located in the abutment groove 10. Since the push spring 9 is located between the piston 3 and the connecting cover 2, the push spring 9 will enter a compressed state when the piston 3 moves backward. When the grease pumping is completed and the user connects the grease gun to the grease gun head, the compressed push spring 9 will push the piston 3 to move forward along the threaded rod 1. At this time, the threaded rod 1 will rotate in place, so that the piston 3 can smoothly push the grease into the grease gun head. The user does not need to rotate the threaded rod 1 again to drive the piston 3 to move forward along the threaded rod 1, which makes it convenient for the user to use the grease gun to add grease to the mechanical equipment.

[0034] Preferably, the inner wall of the connecting cover 2 is provided with an internal thread, which can match the external thread at the top of the grease gun barrel. The bottom of the connecting cover 2 is provided with a through hole 11, and the top of the threaded rod 1 is provided with a drive part 12 with a smooth outer wall. The drive part 12 passes through the through hole 11 and is located above the connecting cover 2. The drive part 12 is provided with a rotating handle 13. Currently, the rear end of grease gun barrels on the market is provided with an external thread, and the internal thread of the inner wall of the connecting cover 2 matches the external thread at the top of the grease gun barrel, so that the connecting cover 2 can be smoothly threaded together with the grease gun barrel. The top of the drive part 12 of the threaded rod 1 passes through the through hole 11 at the bottom of the connecting cover 2 and is located above the connecting cover 2, so that the top of the drive part 12 is exposed outside the grease gun barrel. The outer wall of the drive part 12 is a smooth plane, so when the user rotates the drive part 12 and the threaded rod 1 by rotating the handle 13, the drive part 12 will not cause wear to the connecting cover 2, which can increase the service life of the connecting cover 2. The rotating handle 13 is designed to facilitate the user to control the rotation of the threaded rod 1.

[0035] Preferably, the bottom of the connecting cover 2 has a bearing groove 14, the through hole 11 is formed at the bottom of the bearing groove 14, the bearing groove 14 is provided with a bearing 15, and the bearing 15 is sleeved on the drive part 12; the bearing groove 14 at the bottom of the connecting cover 2 allows the bearing 15 to be smoothly installed on the connecting cover 2, and the bearing 15 sleeved on the drive part 12 can reduce the friction generated by the rotation of the threaded rod 1, making the rotation of the threaded rod 1 smoother.

[0036] Preferably, a sealing groove 16 is provided on the outer wall of the piston 3, and a sealing ring is provided in the sealing groove 16. The sealing ring can fit into the inside of the grease gun barrel. The sealing ring is installed in the sealing groove 16 on the outer wall of the piston 3. The sealing ring can ensure that the piston 3 and the inner wall of the grease gun barrel are in a fitted state, so that the piston 3 can smoothly draw grease into the grease gun barrel after moving backward.

[0037] Preferably, the threaded rod 1 is provided with a free-spinning part 17 with a smooth outer wall. The free-spinning part 17 is located below the connecting cover 2. When the threaded rod 1 is driven to rotate, causing the piston 3 to move backward onto the free-spinning part 17, the piston 3 is in a disengaged state with the threaded rod 1. When the user drives the threaded rod 1 to rotate, the threaded rod 1 will drive the piston 3 to move backward along the threaded rod 1. When the piston 3 moves to the moving position, it will reach the free-spinning part 17 of the threaded rod 1. Since the outer wall of the free-spinning part 17 is a smooth surface, the piston 3 is in a disengaged state with the threaded rod 1. When the user continues to drive the threaded rod 1 to rotate, it will not be able to drive the piston 3 to move backward. This avoids the situation where the piston 3 continues to move backward and apply pressure to the telescopic rod after the telescopic rod has retracted, which could lead to damage to the telescopic rod.

[0038] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A grease gun extraction device, comprising a threaded rod (1), a connecting cap (2) sleeved on the threaded rod (1) and directly or indirectly connected to the grease gun barrel, and a piston (3) sleeved on the threaded rod (1), characterized in that: The piston (3) has a threaded hole (4), and the threaded rod (1) is set in the threaded hole (4) and threadedly connected to the piston (3). A telescopic rod is provided between the piston (3) and the connecting cover (2) to restrict the piston (3) from rotating relative to the threaded rod (1). The two ends of the telescopic rod are connected to the connecting cover (2) and the piston (3) respectively. Driving the threaded rod (1) to rotate can drive the piston (3) to move back and forth along the threaded rod (1).

2. The oil extraction device of a grease gun according to claim 1, characterized in that: The telescopic rod includes a left telescopic rod (7) and a right telescopic rod (8). The threaded rod (1) is located between the left telescopic rod (7) and the right telescopic rod (8). The two ends of the left telescopic rod (7) and the right telescopic rod (8) are fixedly connected to the connecting cover (2) and the piston (3), respectively.

3. The oil extraction device of a grease gun according to claim 1, characterized in that: The telescopic rod includes a first telescopic rod (5) and a second telescopic rod (6) sleeved on the first telescopic rod (5). The rear end of the first telescopic rod (5) is fixedly connected to the connecting cover (2). The rear end of the second telescopic rod (6) is sleeved on the front end of the first telescopic rod (5). The front end of the second telescopic rod (6) is fixedly connected to the piston (3).

4. The oil extraction device of a grease gun according to any one of claims 1-3, characterized in that: A push spring (9) is provided between the piston (3) and the connecting cover (2). The two ends of the push spring (9) abut against the connecting cover (2) and the piston (3) respectively. The top end of the piston (3) is provided with an abutment groove (10). The threaded hole (4) is opened in the abutment groove (10). The bottom end of the push spring (9) is located in the abutment groove (10).

5. The oil extraction device of a grease gun according to any one of claims 1-3, characterized in that: The inner wall of the connecting cover (2) is provided with an internal thread, which can match the external thread at the top of the grease gun barrel. The bottom of the connecting cover (2) is provided with a through hole (11). The top of the threaded rod (1) is provided with a driving part (12) with a smooth outer wall. The driving part (12) passes through the through hole (11) and is located above the connecting cover (2). The driving part (12) is provided with a rotating handle (13).

6. The oil extraction device of a grease gun according to claim 5, characterized in that: The bottom of the connecting cover (2) has a bearing groove (14), the through hole (11) is opened at the bottom of the bearing groove (14), the bearing groove (14) is provided with a bearing (15), and the bearing (15) is sleeved on the drive part (12).

7. The oil extraction device of a grease gun according to any one of claims 1-3, characterized in that: The piston (3) has a sealing groove (16) on its outer wall, and a sealing ring is provided in the sealing groove (16), which can fit into the inside of the grease gun barrel.

8. The oil extraction device of a grease gun according to any one of claims 1-3, characterized in that: The threaded rod (1) is provided with a free-spinning part (17) with a smooth outer wall. The free-spinning part (17) is located below the connecting cover (2). When the threaded rod (1) is driven to rotate and drive the piston (3) to move backward to the free-spinning part (17), the piston (3) and the threaded rod (1) are in a disengaged state.

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